Custom command executes immediately and returns error 'not a function'

[rmnrdi]

I added two very simple custom commands to cypress. These are just to demonstrate my issue.
When I put them in a test, those functions execute immediately and get a 'not a function' error.
If I put cy.wait() or cy.pause() at the top of the test case, those functions still execute immediately.
If I pull the functionality out of the custom commands and put them directly in the test case,
the functionality works fine.

it.only('should open status update page', () => {
cy.pause()
//Executes immediately and gets ERROR cy.VisitThis is not a function
cy.VisitThis('/app/order-status-update/#').url().should('include', 'order-status-update');
//cy.visit('/app/order-status-update/#').url().should('include', 'order-status-update'); //Works fine

//Executes immediately and gets ERROR cy.GetThisis not a function
// cy.GetThis('#TfrmOrderStatusUpdate_wcEditBox28').type('114'); //Also returns 'not a function' error
//cy.get('#TfrmOrderStatusUpdate_wcEditBox28 .dx-texteditor-input').type('114'); //Works fine

Here are the custom commands
Cypress.Commands.add('GetThis', (selector) => {
cy.get(selector).should('exist');
});

Cypress.Commands.add('VisitThis', (url) => {
cy.visit(url);
});

Here are the command definitions
GetThis(selector: string): Chainable;
VisitThis(url: string): Chainable;

The question is, why are custom commands executing before they're being called?
Also, I've tried various Chainable types and those don't work either.
Any help would be greatly appreciated!

[rmnrdi]

I found the issue.
I had an extra set of closing braces }); at the end of the command.ts file.
TS can't count apparently